大型水下盾构隧道结构设计关键问题研究

发布时间：2018-01-12 11:19

本文关键词：大型水下盾构隧道结构设计关键问题研究　出处：《西南交通大学》2014年博士论文　论文类型：学位论文

【摘要】：当前,我国正处于大型水下隧道建设的快速发展期,在国家经济发展的需求下,大批的大型水下隧道工程正开工建设,其中大量采用了盾构法修建。然而,在面临水下复杂地质环境、结构大型化的挑战时,原有的盾构隧道结构设计经验、理论、技术与方法都呈现出了一些问题,如何完善大型水下盾构隧道结构设计方法,保障隧道结构安全、经济、合理、耐久已然成为亟待解决的关键问题。鉴于此,本文针对大型水下盾构隧道结构设计中存在的若干关键问题开展研究,具有重要工程价值。论文以作者主持设计的几座典型的大型水下盾构隧道——广深港高速铁路狮子洋隧道、南京长江隧道、武汉长江隧道、武汉三阳路长江隧道等为背景,结合国家高技术发展计划(863计划)课题——“大型跨江海隧道结构力学特征及整体化设计方法研究”等国家重大课题开展研究工作,紧紧围绕大型水下盾构隧道结构设计的关键问题,分别从整体化设计方法、荷载取值、结构合理化设计参数以及结构分析方法等多个方面开展深入的研究,得到主要研究结论如下1、提出了水下盾构隧道整体化设计的概念,建立了水下盾构隧道整体化设计的基本架构,明确了水下盾构隧道整体化设计的目标与影响因素与设计思路,提出了采用层次分析法、模糊综合评判法和专家综合评估法等数学方法建立水下盾构隧道整体化设计的评估理论和决策方法,采用线性规划、非线性规划、无约束优化方法、蒙特卡罗法和人工神经网络法等寻求最优设计方案的整体化设计构思,并采用整体化设计方法对狮子洋隧道衬砌结构设计方案进行最优化比选。2、从盾构施工对围岩的影响以及围岩-结构的相互作用两方面考量水下盾构隧道荷载的产生与作用效应,分析了泥水盾构施工过程中泥水作用、流固耦合效应、盾尾注浆及管片壁后注浆、围岩-结构的相互协调作用等“施工效应”对于水下盾构隧道荷载的影响。在此基础上,提出了考虑泥水盾构“施工效应”的修正收敛-约束法。以广深港高速铁路狮子洋隧道为例,针对软土、硬岩、软硬不均地层开展了水、土压力荷载的现场实测,证实了泥水盾构施工效应对于大断面水下盾构隧道施工期乃至最终受荷的重要影响,验证了修正收敛-约束法的适用性与可靠性,并对目前水下盾构隧道常用的荷载计算方法提出了使用建议。3、从结构受力性能、隧道防水及结构可靠性、施工难易程度以工程造价与工期等方面综合考量衬砌结构性能,提出了适应于河床冲淤变化及水位变化的非封闭内衬型双层衬砌。从管片制作、运输、安装及受力特性等方面深入对比分析,给出了大型水下盾构隧道管片衬砌结构分块方式、管片厚度以及管片幅宽的合理化取值参数。对不同螺栓连接形式、接缝防水类型对接头受力特性和防水性能的影响进行分析,并在此基础上给出了大型水下盾构隧道接头连接方式以及接缝防水措施建议。4、针对大型水下盾构法隧道结构特点及荷载复杂环境的影响,建立了以考虑接头刚度迭代算法的梁-弹簧模型为主,考虑管片开裂影响的梁-弹簧模型以及考量幅宽影响的三维壳-弹簧模型为辅的,能够综合考量接头刚度的非线性迭代取值、管片错缝拼装效应、裂缝影响以及幅宽影响的大型水下盾构法隧道管片衬砌结构横向分析方法体系。提出了能够准确考虑管片环及接头力学特征的三维多环轴向等效刚度模型,弥补了既有三维骨架模型建模单元数目巨大以及建模过程复杂的不足,为大型盾构隧道管片衬砌纵向力学分析提供了实用方法。
[Abstract]:At present, China is in a period of rapid development of tunnel construction in large water, the need of national economic development, a large number of large water tunnel project is under construction, which uses a lot of shield construction. However, in the face of complex geological environment of large scale structure of the challenge, the experience of shield tunnel the structure of the original design theory, technology and method and presents some problems, how to improve the large underwater shield tunnel structure design method, ensure the tunnel structure safety, economy, reasonable, durability has become the key problems to be solved. In view of this, this paper focuses on the key problems of tunnel structure design in large water research has important engineering value. The paper by the author presided over the design of several typical large underwater shield tunnel - XRL Shiziyang Tunnel, Nanjing Yangtze River tunnel, Wuhan The Yangtze River tunnel, Wuhan Sanyang road Yangtze River Tunnel as the background, combined with the national high technology research and development program (863 Program) major project -- "large subaqueous tunnel structure mechanics characteristics and the overall design method of other countries to carry out research work, focus on the key problems of shield tunnel structure design for large scale underwater, respectively design method from the whole, load value, study a reasonable structure parameter design and structure analysis method, obtained the main findings are as follows: 1, put forward the concept of underwater shield tunnel integrated design, established the basic framework of the whole underwater shield tunnel design, clear water shield tunnel and target the overall design of the influence factors and design ideas, put forward by AHP, underwater establish fuzzy comprehensive evaluation method and expert evaluation method The overall design of the shield tunnel evaluation theory and decision making method, using linear programming, nonlinear programming, constrained optimization methods, the overall design for the optimal design of Monte Carlo method and artificial neural network method, and the overall design method of Shiziyang Tunnel lining structure design scheme optimization selection.2, from two in terms of shield construction impact on the surrounding rock and the surrounding rock structure interaction and consider the effect of load of shield tunnel under water, analyzes the effect of mud slurry shield construction process, the coupling effect, the shield tail grouting and grouting behind segment, influence on surrounding rock structure interaction such as "construction effect" for the load of shield tunnel under the water. On this basis, the proposed amendment to consider convergence of slurry shield construction effect "- constraint method. With the ERL lion Ocean tunnel as an example, aiming at the soft soil, hard rock, soft hard ground to carry out water, field test of earth pressure, confirmed the construction of slurry shield effect on the construction period of underwater shield tunnel with large cross section and is greatly influenced by load, verify the applicability and reliability of convergence confinement method, and the current commonly used underwater shield tunnel load calculation method is presented using the proposed.3, the structure stress performance, reliability of tunnel waterproof and structure, the difficulty of construction project cost and duration and comprehensive consideration of lining structure performance, put forward the non closed type double lining lining on riverbed erosion and water level change from the segment production, transportation, installation and the paper analyzes stress characteristics and so on, given the lining structure of shield tunnel segment large underwater block, and the width of the segment thickness of rational value For different parameters. The bolt joint, analyzed the impact characteristics and waterproof waterproofing type of the joint force, and based on the joint of the shield tunnel large underwater connection and proposed joint waterproofing measures of.4, aiming at the large underwater shield tunnel structure characteristics and the influence of load in complex environment, is established in order to consider the joint stiffness iterative beam spring model, considering the influence of segment cracking beam spring model and considering the width influence of 3D shell spring model can be supplemented, comprehensive consideration of the stiffness of the joint non linear iterative value segment staggered assembling effect, large water effects and the effects of the crack width shield tunnel lining structure transverse analysis system. Put forward to accurately consider the 3D polycyclic axial equivalent and mechanical characteristics of segment ring stiffness model, make up for The existing 3D skeleton model has large number of modeling units and complex modeling process, which provides a practical method for longitudinal mechanics analysis of segment lining of large shield tunnel.

【学位授予单位】：西南交通大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：U455.43

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